JP2000142762A - Hinged cap excellent in assorted disposal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinged cap excellent in assorted disposal for which tear at scores formed at a cylindrical side wall is easy while rupture at the cylindrical side wall is effectively prevented on an occasion of capping. SOLUTION: A slit 30 is formed at the thick part of a cylindrical side wall 6 on which an upper cap 2 is provided, extending downward from its upper end so as to reach a position lower than the top of an engaging protuberance while not reaching the lower end of the cylindrical side wall. The slit 30 extends, as seen from above, to both sides of a hinged connecting part for connecting a cap main body 1 and the upper cap 2, including the hinged connecting part, and scores extending downward from the upper end of the slit 30 toward the external face of the cylindrical side wall are formed at positions near the ends on both sides of the hinged connecting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the separation and disposal of a hinge cap having a cap body fitted and fixed to a container mouth wall, and more particularly to the use of a special tool. And a hinge cap that allows the cap body to be easily removed from the container mouth by tearing by hand.

[0002]

2. Description of the Related Art Separation and disposal of garbage has recently been required from the standpoint of garbage disposal and resource saving. In particular, the separation and disposal of plastic caps attached to container mouths has also been required. I have. By the way, many plastic caps include a cap main body fitted and fixed to a container mouth, and an upper lid hinged to the cap main body so as to be openable and closable. That is, since this type of cap has a cap body fitted and fixed in the container mouth, removing a used cap from the container mouth generally requires a tool such as a bottle opener. The removal operation was extremely troublesome, and the separation and disposal property was extremely unsatisfactory.

[0003] For this reason, many proposals have been made to improve the separation and disposal of this type of cap. For example,
In Japanese Utility Model Laid-Open Publication No. Hei 7-11559 and Japanese Utility Model Laid-Open Publication No. Hei 5-34151, regarding the above-described hinge cap, a score extending downward from the vicinity of the hinge connection part with the upper lid is formed on the cylindrical side wall of the cap body. A hinge cap is disclosed. These hinge caps tear the score of the cylindrical side wall portion by holding down the upper lid by hand and pushing down, thereby breaking the cylindrical side wall portion, so that the cap can be easily removed without using a special tool. It can be removed from the mouth.

However, the caps disclosed in these prior arts have a problem in that the score of the cylindrical side wall cannot be easily torn. That is, since the cylindrical side wall portion is fitted and fixed to the container mouth portion, it is formed to be relatively thick, and further, in order to firmly fix to the container mouth portion,
A projection is formed to engage with the outer surface of the container mouth. Therefore, considerable force is required to tear the score formed in this portion. Further, in order to easily tear the score, it is conceivable to form the score deeply and reduce the thickness of the score forming portion. However, in this case, during the capping step of attaching the cap body to the container mouth, the cylindrical side wall portion is easily broken.

Further, in order to easily tear the score formed on the cylindrical side wall, for example, it is preferable to provide an appropriate knob on the top plate connected to the upper end of the cylindrical side wall. By pulling the score by hand, the score can be easily torn. In this case, it is not preferable to provide a score tearing tab on the cylindrical side wall portion, since it is easy for a general user to erroneously tear the score for the cap being used.

[0006]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to easily tear a score formed on a cylindrical side wall portion without providing a special knob, and furthermore, to form a cylindrical side wall portion during capping. Another object of the present invention is to provide a hinge cap having a good separation and disposal property in which the breakage of the hinge is effectively prevented.

[0007]

According to the present invention, there is provided a cap body having a top plate portion and a cylindrical side wall hanging down from a peripheral edge of the top plate portion, and a hinge connected to an upper end portion of the cylindrical side wall of the cap body. And an inner surface of the cylindrical side wall,
An engagement projection which can be engaged with an outer surface of the container mouth is formed, and the cap body is attached to the container mouth by fitting the container mouth into the cylindrical side wall. In the thickness portion of the cylindrical side wall provided with, it does not extend downward from the upper end to the lower end of the cylindrical side wall, but at least to a portion below the top of the engagement protrusion. An extended slit is formed, and the slit extends on both sides from the hinge connection portion so as to include at least a hinge connection portion between the cap body and the upper lid when viewed from above, Hinge caps are provided in the vicinity of both ends, each of which has a score extending from the upper end to the lower part of the slit toward the outer surface of the cylindrical side wall.

An important feature of the hinge cap described above is that
The thickness of the cylindrical side wall is formed with a slit extending downward from the upper end to a portion below the top of the engagement protrusion. That is, when viewed from above, the slit extends at least on both sides from the hinge connection portion so as to include the hinge connection portion between the cap body and the upper lid. Each of the side walls is divided into a thin outer side wall and an inner side wall, and both side walls are connected at a lower portion. In the vicinity of both ends of the hinge connection part, scores are formed extending from the upper end to the lower part of the slit toward the outer surface of the cylindrical side wall. In particular, this score preferably extends from the upper end to the lower end of the slit.

Accordingly, when the cap body is inserted into the container opening by capping (plugging), the engaging projection formed on the inner surface of the cylindrical side wall (the inner surface of the inner wall) rides on the outer surface of the container opening. The thin inner wall expands outward, but closely adheres to the outer wall at the slit. That is, the outer side wall suppresses the inner side wall from further spreading outward, and effectively prevents the fitting force with the container opening from lowering. In addition, since no score is formed on the thin inner wall extending outward during capping, breakage of the score during capping is effectively prevented. After capping, the inner wall is loosened by the outer wall, thus ensuring a sufficient seal.

Further, the score is torn by pulling down the hinge connecting portion of the upper lid downward. The tearing opens the annular outer wall near both ends of the hinge connecting portion. Tag fastening force is released. Accordingly, by pulling up the upper lid as a knob, the lower end of the cylindrical side wall in the hinge connection portion can be turned up, and the cap body can be pulled out from the container opening.

In the present invention, the slit may be provided over the entire circumference of the cylindrical side wall, or the slit may be formed in the cylindrical side wall as long as the slit includes a portion where the hinge connection portion is formed. There may be parts that have not been done. However, it is preferable that the slit is formed at least over a half circumference of the cylindrical side wall. That is,
If the area where this slit is formed is too small,
There is no point in providing the slit. For example, since the outer wall of the cylindrical side wall divided by the slit reduces the loosening force, even if the upper lid is pulled down and the score is torn, the cap body (cylindrical side wall) and the container are removed. The fitting force with the mouth does not decrease, and as a result, it becomes difficult to remove the cap body from the container mouth by rolling up the cylindrical side wall.

In the present invention, it is preferable that at least one drainage hole communicating with the slit and extending to the lower end is provided in the cylindrical side wall. That is,
In the hinge cap having the slit as described above, after the cap is washed with water as necessary, it is attached to the container mouth with the upper lid closed, and even after being attached to the container mouth, washing with water as necessary, Alternatively, shower cooling is performed. Therefore, when water enters the slit, the intruded water does not easily escape, and when the upper lid is closed, drying is not sufficiently performed. By providing the above-mentioned drain holes, such a trouble can be effectively solved.

In the above-mentioned hinge cap, a slit (first slit) is formed only in the upper part of the cylindrical side wall, but a slit (second slit) can be provided in this lower part as well. This second slit is the first slit except for the portion where the hinge connection portion is formed.
The upper end of the second slit is located slightly lower than the lower end of the first slit. By providing such a second slit, the engaging force between the cylindrical side wall and the outer surface of the container opening when the score is broken by pulling down the upper cover is further weakened. Can be more easily extracted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific examples shown in the accompanying drawings. FIG. 1 is a top plan view when the upper lid of the hinge cap of the present invention is in an open state,
2 is a side sectional view when the upper lid of the hinge cap of FIG. 1 is in an open state, FIG. 3 is a bottom view when the upper lid of the hinge cap of FIG. 1 is in an open state, and FIG. FIG. 5 is a side sectional view showing the hinge cap of FIG. 1 in a state where the upper lid is closed, and FIG. 5 shows the hinge cap of FIG. .

1 to 4, the hinge cap comprises a cap body 1 and an upper lid 2. The cap body 1 roughly includes a top plate portion 5 and a cylindrical side wall 6 hanging from a peripheral edge of the top plate portion 5, and the upper lid 2 is hinged to an upper end of the cylindrical side wall 6 (see FIG. At both ends of the hinge connection portion 7, connection bands 7 a, 7 a are provided at both ends of the upper cover 2 so that the upper cover 2 can be smoothly swung and the open state of the upper cover 2 can be maintained. When the upper lid 2 is turned and closed, the top plate 5 is completely covered.

On the inner surface of the cylindrical side wall 6 of the cap body 1,
A circumferential engaging projection 8 is formed, and an inner ring 9 is formed on the inner peripheral portion of the inner surface of the top plate 5 so as to extend downward with a distance from the cylindrical side wall 6. That is, a container opening (not shown) is fitted into the space between the inner ring 9 and the cylindrical side wall 6, and the cap body 1 is firmly fixed to the container opening by the circumferential projection 8.

A score 15 for forming an opening for pouring is formed on the top plate 5 of the cap body 1, and a tab ring 16 for breaking the score is provided on the upper surface of the top plate 5. When the tab ring 16 is pulled, the score 15 is broken, and an opening for pouring is formed. The score 15 is for forming an opening for discharging the content liquid, and is completely different from the score provided for removing a cap body described later from the container mouth. On the upper surface side of the top plate portion 5, a cylindrical projection 17 for discharging liquid is formed so as to surround the score 15, and the content liquid poured out through the discharging opening is formed in this cylindrical shape. It is guided along the projection 17.

The upper lid 2 is formed of a top plate 20 and a skirt 21 extending from the periphery of the top plate 20. A peripheral projection 22 for sealing is formed on the inner surface of the top plate 20. Have been. That is, when the upper lid 2 is closed, the outer surface of the circumferential protrusion 22 is in close contact with the inner surface of the cylindrical protrusion 17, and the close contact causes breakage of the score 15 after formation of the pouring opening. Sealability is ensured. In this case, FIG.
It is preferable that the height of the cylindrical projection 17 on the hinge connecting portion 7 side is made shorter. By doing so, the upper lid 2 can be effectively closed even if the length of the peripheral projections 22 is set relatively large, which is advantageous in ensuring the sealing performance after the formation of the pouring opening.

On the peripheral edge of the upper surface of the top plate 5, a relatively short circumferential projection 25 for locking the upper lid is formed.
A concave portion 26 is formed in the peripheral edge portion of. That is,
When the upper lid 2 is closed, the circumferential projection 25 and the concave portion 26 engage with each other, whereby the closed state of the upper lid 2 is maintained. On the inner surface of the top plate 20 of the upper lid 2, an arc-shaped protrusion 27 having substantially the same length as the circumferential protrusion 22 is formed at a position between the skirt 21 and the circumferential protrusion 22. This arc-shaped projection 2
Numeral 7 is located outside the cylindrical projection 17 when the upper lid 2 is closed. That is, when the upper lid 2 is deformed by an external force from the upper part, the arc-shaped projection 27 comes into contact with the upper surface of the top plate portion 5, so that the deformation causes the circumferential projection 27 to bite into the top plate portion 5 and break the score 15. Is effectively prevented. Furthermore, the skirt 21 of the upper lid 2
An opening tab 28 is provided at the lower end on the side opposite to the hinge connecting portion 7 so that the upper lid 2 can be easily opened by hooking the opening tab 28 with a finger.

In the hinge cap of the present invention, a slit 30 extending downward from the upper end is provided in the middle portion of the cylindrical side wall 6 in the thickness portion. The slit 30 is formed over the entire circumference of the cylindrical side wall 6 as understood from FIG.
It is divided into an inner wall 6a and an outer wall 6b. FIG. 2
As can be understood from FIG. 3, the slit 30 does not extend to the lower end of the cylindrical side wall, and the inner side wall 6a and the outer side wall 6b are integrally connected at a lower portion. Further, as shown in FIG. 1 and FIG.
1, 31 are formed. These scores 31 extend from the upper end to the lower end of the slit 30 toward the outer surface of the outer wall 6b, and the scores 31 make the vicinity of both ends of the connecting portion 7 of the outer wall 6b thin.

In the hinge cap of the present invention, by forming the slits 30 and the scores 31 as described above, damage to the cap body 1 at the time of capping is effectively prevented, and the gap between the cap body 1 and the container opening is prevented. This hinge cap can be easily removed from the container opening without lowering the engagement force, providing no special knob, and using no special tool.

For example, when the cap main body 1 in which the slit 30 is formed is capped (plugged) in the container mouth, the upper end of the container mouth is positioned between the cylindrical side wall 6 and the inner ring 9. As it is inserted into the space, the engagement protrusion 8 formed on the inner surface of the cylindrical side wall 6
A large-diameter convex portion (100, 100) formed on the outer surface of the container mouth
(See FIG. 5). At this time, the inner wall 6a spreads outward, but is tightly protected by the inner surface of the outer wall 6b, and the inner wall 6a is not provided with any weakened portion such as a score. Therefore, breakage of the cap body 1 at the time of capping is effectively prevented. Further, after capping, the inner side wall 6a is loosely fastened by the outer side wall 6b, so that the engaging force between the engaging projection 8 and the convex portion 100 on the outer surface of the container opening is reinforced, and sufficient sealing performance is secured. You.

Further, as shown in FIG. 5, when the cap body 1 is attached to the container mouth, the upper lid 2 is opened, and the upper lid 2 is held down by hand and pulled down. Score 3 provided near both ends of connecting portion 7
The outer wall 6a is torn along 1 and 31, and the upper lid 2
The lower part of the slit 30 is connected to the cylindrical side wall 6. In this state, since the annular outer wall 6a has been torn, the loosening force of the outer wall 6a has been released, and the engaging force between the engaging projection 8 and the convex portion 100 on the outer surface of the container mouth is remarkably increased. Being weakened. Therefore, the cap body 1 can be easily removed from the container opening by pulling up the upper lid 2 and, if necessary, turning up the lower end of the cylindrical side wall 6 by hand. In this case, before the upper lid 2 is pulled up, the outer wall 6a torn along the score 31 may be turned up in the circumferential direction and torn.

As is clear from the above description, the slit 3
0 needs to extend at least below the top 8a of the engagement projection 8 formed on the inner surface of the cylindrical side wall 6. That is, at the top portion 8a, the engaging force between the engaging projection 8 after capping and the convex portion 100 of the container opening is the largest. Therefore, the slit 30 is located at the top 8a.
Otherwise, even if the outer wall 6b is torn along the score 31 to release the loosening force, the engaging force between the engaging protrusion 8 and the convex portion 100 of the container mouth does not decrease sufficiently.
It becomes difficult to remove the cap body 1 from the container mouth.

However, if the slit 30 is extended to the lower side more than necessary, the lower end of the cylindrical side wall 6 in which the slit 30 is not formed is apt to be accidentally broken. May be released and the sealing property may be impaired. Therefore, it is preferable that the lower end of the cylindrical side wall 6 where the slit 30 is not formed has a sufficient length. In general, the lower end of the slit 30 is formed in a portion near the bottom of the lower end of the engaging projection 8. It is better to be located.

In the present invention, a drain hole 35 is formed in the cylindrical side wall 6 where the connecting portion 7 of the cap body 1 is formed.
Is provided. The drain hole 35 is provided in the slit 30
Are formed at a lower portion where the inner wall 6a and the outer wall 6b are integrally connected,
It extends to the lower end of the cylindrical side wall 6, and the upper end communicates with the slit 30. Therefore, even when water used for washing the hinge cap or for cooling after the cap is attached to the container mouth enters the slit 30, the water is easily removed and the drying efficiency is improved. improves. In the hinge cap shown in FIGS. 1 to 5 described above,
In particular, as can be understood from the bottom view of FIG. 3, two drain holes 35 are provided, but the number is not particularly limited as long as draining and drying from the slit 30 are performed effectively.
For example, one or three or more water drain holes 35 can be provided. Also, this drain hole 35 is
It may be provided at a portion where the hinge connecting portion 7 is not formed. Further, by forming the lower end of the slit 30 into a shape inclined downward toward the drainage hole 35, the drainage effect can be improved.

In the present invention, the above-mentioned slit 3
0 is preferably formed over the entire circumference of the cylindrical side wall 6, but the outer side wall 6 is formed by tearing along the score 31.
By releasing the hoop tightening force of b, the engaging force between the engaging projection 8 and the convex portion 100 on the outer surface of the container opening is sufficiently reduced, and the cap body 1 (the cylindrical side wall 6) is easily removed from the container opening. It is not necessary to form the slit 30 over the entire circumference of the cylindrical side wall 6 as long as
The slit 30 may not be formed in the cylindrical side wall 6 on the opposite side to the above. Normally, it depends on the size of the cap (diameter of the cylindrical side wall), but it is necessary to form the slit 30 over half or more of the cylindrical side wall.

In the present invention, the slit 30
The second slit may be formed on the lower side (the bottom of the cylindrical side wall 6 where the inner wall 6a and the outer wall 6b are continuous) except for the connecting portion 7. This example is shown in FIGS. FIG.
FIG. 7 is a top plan view when the upper lid of the hinge cap is open, FIG. 7 is a side sectional view when the upper lid of the hinge cap is open in FIG. 6, and FIG. 8 is a hinge of FIG. FIG. 9 is a bottom view when the upper lid of the cap is in the open state, FIG. 9 is a side view when the upper lid of the hinge cap of FIG. 6 is closed, and FIG.
FIG. 7 is a diagram showing a state in which the outer wall formed by the slit is torn up in the circumferential direction and torn in the hinge cap of FIG. 6.

The caps of FIGS. 6 to 10 have exactly the same structure as the caps shown in FIGS. 1 to 5 except that a second slit 50 is provided. Therefore, in FIGS. 6 to 10, the portions other than the second slit 50 have the same reference numerals as those in FIGS.

6 to 10, a second slit 50 extends from the lower end of the bottom of the cylindrical side wall 6, as is apparent from the side sectional view of FIG. 7 and the bottom view of FIG. A connecting portion 51 is formed between the first slit 30 and the second slit 50. The second slit 50 is located below the slit 30 described above (hereinafter, referred to as the first slit 30), but the second slit 50 is formed in the hinge connection portion 7. It has not been. That is, a score 31 for tearing the outer wall 6b is located above both ends of the second slit 50 located near both ends of the hinge connection portion 7. When the second slit 50 is formed in the hinge connecting part 7, when the upper lid 2 is pulled up after the score 31 is torn, the connecting part 51 between the first slit 30 and the second slit 50 is broken, and the upper lid 2 is broken. This is because only 2 comes off and the entire cap cannot be removed from the container opening.

In the hinge cap of this embodiment,
Since the second slit 50 is provided at the bottom of the cylindrical side wall 6 where the first slit 30 is not formed, the cap can be more easily removed from the container opening. That is, in the hinge cap of FIGS. 1 to 5 described above, even if the outer wall 6b is torn along the score 31, the lower end of the outer wall 6b is continuous with the cylindrical side wall 6 to form an annular shape. Is not completely zero. However, in the hinge cap of FIGS.
After the outer wall 6b around the first slit 30 is torn, as shown in FIG.
Once the outer wall 6b around the inner wall 6b and the outer wall 6b around the second slit 50 are peeled off integrally in the circumferential direction, the loosening force applied to the inner wall 6a becomes completely zero. Therefore,
By pulling up the upper lid 2, the cap body 1 can be more easily removed from the container mouth.

In the above-mentioned hinge cap, a second slit 50 is formed below the first slit 30 except for the hinge connecting portion 7, whereby the skirt is also divided into an inner wall 6a and an outer wall 6b. The outer wall 6b is
In order to protect “a”, breakage of the cylindrical side wall and deterioration of the sealing property during capping are effectively prevented.

The distance d between the first slit 30 and the second slit 50, that is, the thickness of the connecting portion 51 is 0.3 to 0.3.
Preferably, it is set to about 0.4 mm. If the distance d is too short, this portion is likely to be broken at the time of capping, and if such a break occurs, the loosening force of the outer wall 6b is reduced, and the sealing performance after capping may be reduced. . If the distance d is set to be too long, the provision of the second slit 50 becomes meaningless.

When the cap body 1 is to be removed from the mouth of the container as shown in FIG. 10, the first slit 30 is formed over the entire periphery of the cylindrical side wall 6 and all the parts except the hinge connection part 7 are formed. Since the second slit 50 is formed at the bottom of the cylindrical side wall 6 over the portion of the outer wall 6b, the outer wall 6b can be completely torn and peeled off from the cap body 1, but usually, the torn outer wall 6 6b
Is preferably connected to the cap body 1.
That is, if the outer wall 6b is completely peeled off from the cap main body 1, the hinge cap removed from the container mouth is separated into two pieces and separated, which is never advantageous for disposal. Because it must not be.

It is preferable that a score is formed on at least one of both ends of the second slit 50 (boundary portion with the hinge connecting portion 7) from the slit 50 toward the outer surface of the outer wall 6b. . Thereby, after tearing along the score 31, the second slit 5
The connection portion 51 can be easily torn by tearing the outer wall 6b around the zero.

In the present invention, the resin used for molding the hinge caps having various structures described above includes various plastics, for example, low-, medium- or high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyester. , Polyamide, styrene resin, ABS
Resins and the like are generally used. The hinge cap of the present invention can be manufactured by integral molding such as injection molding and compression molding using such a resin. In addition, the above-described first slit 30 and second slit 50 and the like can be formed by integral molding. However, in some cases, they can be formed by post-processing such as cutting.

[0037]

According to the present invention, a special tool is formed by forming a slit from the upper end on the cylindrical side wall of the cap body to divide the inner side wall and the outer side wall, and connecting the upper lid to the outer side wall by hinge. The cap body can be removed from the container opening integrally with the upper lid without using a container, and the separation and disposal properties are extremely good. Moreover, since tearing of the outer wall along the score performed when removing the cap body from the container mouth is performed with the upper lid,
There is no need to provide a special knob for this tear. Further, since the inner side wall divided by the slit is covered by the outer side wall, the inner side wall is loosely fastened by the outer side wall in a state where the cap body is attached to the container mouth portion. A sufficient fitting force is secured between the cap body and the cap body. In addition, at the time of capping, the score provided on the outer wall spreads outward via the inner wall, but the score is not provided directly on the inner wall, so that there is no possibility that the score will break at this time.

[Brief description of the drawings]

FIG. 1 is a top plan view when an upper lid of a hinge cap according to the present invention is in an open state.

FIG. 2 is a side cross-sectional view when the upper lid of the hinge cap of FIG. 1 is in an open state.

FIG. 3 is a bottom view when the upper lid of the hinge cap of FIG. 1 is in an open state;

FIG. 4 is a side view when the upper lid of the hinge cap of FIG. 1 is in a closed state.

FIG. 5 is a diagram showing a state in which the upper lid is pulled down and the outer wall is torn along the score in the hinge cap of FIG. 1;

FIG. 6 is a top plan view of the hinge cap of another example of the present invention when the upper lid is in an open state.

7 is a side cross-sectional view when the upper lid of the hinge cap of FIG. 6 is in an open state.

FIG. 8 is a bottom view when the upper lid of the hinge cap of FIG. 6 is in an open state;

9 is a side view when the upper lid of the hinge cap of FIG. 6 is in a closed state.

FIG. 10 is a diagram showing a state in which the outer wall is torn in the circumferential direction in the hinge cap of FIG. 6;

[Explanation of symbols]

 1: Cap body 2: Top lid 5: Top plate 6: Cylindrical side wall 6a: Outer side wall 6b: Inner side wall 7: Connection band 30: Slit 31: Score 35: Drain hole 50: Second slit

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Shibayama 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Prefecture Inside the Hiratsuka Plant of Japan Crown Cork Co., Ltd. (72) Inventor Osamu Ishii 2-12 Nagatoro, Hiratsuka-shi, Kanagawa Japan Nippon Crown Cork F-term in Hiratsuka Plant Co., Ltd. (reference) 3E084 BA03 CA01 CB01 CB02 CB04 CC03 CC04 CC05 DA01 DB01 DB13 DB20 DC03 DC04 DC05 FA03 FA09 FC07 GA06 GA08 GB06 GB08 GB12 GB17 HA03 HB02 HC03 HD04 LA03

Claims (5)

[Claims] 1. A cap body having a top plate portion and a cylindrical side wall hanging down from the periphery of the top plate portion, and an upper lid hinged to an upper end of the cylindrical side wall of the cap body. The inner surface is formed with an engagement projection which can be engaged with the outer surface of the container mouth, and the hinge body is mounted on the container mouth by fitting the container mouth into the cylindrical side wall. In the thickness portion of the cylindrical side wall on which the upper lid is provided, it does not extend downward from the upper end to the lower end of the cylindrical side wall, but at least lower than the top of the engagement protrusion. A slit extending to the side portion is formed, and the slit extends on both sides from the hinge connection portion so as to include at least a hinge connection portion between the cap body and the upper lid when viewed from above, Hin The near both ends of the connecting portions, respectively, hinge cap, wherein a score extending toward the cylindrical sidewall outer surface toward the bottom from the top of the slit is formed. 2. The hinge cap according to claim 1, wherein the tubular side wall has at least one drainage hole communicating with the slit and extending to a lower end. 3. The hinge cap according to claim 1, wherein the slit is formed over the entire circumference of the cylindrical side wall. 4. The slit is formed over a half circumference of the cylindrical side wall, but is not formed on the cylindrical side wall located at a portion opposite to the hinge connection portion.
4. A hinge cap according to claim 1. 5. A second slit extends from a lower end of the cylindrical side wall corresponding to the slit at a thickness portion of the cylindrical side wall below the slit, except for a hinge connection portion,
The hinge cap according to claim 1, wherein the upper end of the second slit is located at a small interval below the lower end of the slit.